Korban Oleh Ve yored
The reasons one might choose to bring a Korban Oleh Veyored are the following: either a person heard someone swear and was a whiteness and didn't tell anyone, or if a person touches an unclean thing for example an unclean beast or the carcass of an unclean cattle, and if a person swears do do evil or good and forgets about it. An example of this in the pasuk is: ונפש כי תחטא ושמעה קול אלה והוא עד או ראה או ידע אם לוא יגיד ונשא עונו: Rav Mishkin explains: " occasionally the nature of korban chatat depends on the finical status of the person offering it. Rich people are required to spend more on their korbans, and poor people are allowed to offer a less expensive atonement. Because the value of such a korban fluctuates, it is know as a Korban Oleh Veyored, which means that the price goes up (Oleh) for the wealthy, or down (yored) for the poor."